8230392: Define AArch64 as MULTI_COPY_ATOMIC

[Andrew Haley]

On 1/23/20 10:41 PM, David Holmes wrote:
> This does make me wonder whether other lock-free code in the VM needs
> special handling for non-CPU_MULTI_COPY_ATOMIC ??

I don't think we should do exactly that. I would have thoght that
where an algorithm needs anything stronger than acquire/release
consistency we should use explicit sequentially-consistent loads and
stores.

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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